| Records |
| Author |
Marchant, P. |
| Title |
Do brighter, whiter street lights improve road safety? |
Type |
Journal Article |
| Year |
2019 |
Publication |
Significance |
Abbreviated Journal |
Significance |
| Volume |
16 |
Issue |
5 |
Pages |
8-9 |
| Keywords |
Public Safety; Lighting; Statistics |
| Abstract |
Would a billion‐dollar investment in improved street lighting make Australian roads safer at night? Paul Marchant finds the evidence wanting |
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Edition |
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| ISSN |
1740-9705 |
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| Call Number |
GFZ @ kyba @ |
Serial  |
2686 |
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| Author |
Bará, S. |
| Title |
Black-body luminance and magnitudes per square arcsecond in the Johnson-Cousins BVR photometric bands |
Type |
Journal Article |
| Year |
2019 |
Publication |
Photonics Letters of Poland |
Abbreviated Journal |
Photon. Lett. Pl. |
| Volume |
11 |
Issue |
3 |
Pages |
63 |
| Keywords |
Skyglow; night sky brightness; luminance; photometric |
| Abstract |
A relevant amount of light pollution studies deal with the unwanted visual effects of artificial light at night, including the anthropogenic luminance of the sky that hinders the observation of the celestial bodies which are a main target of ground-based astrophysical research, and a key asset of the intangible heritage of humankind. Most quantitative measurements and numerical models, however, evaluate the anthropogenic sky radiance in any of the standard Johnson-Cousins UBVRI photometric bands, generally in the V one. Since the Johnson-Cousins V band is not identical with the visual CIE V-lambda used to assess luminance, the conversion between these two photometric systems turns out to be spectrum-dependent. Given its interest for practical applications, in this Letter we provide the framework to perform this conversion and the transformation constants for black-body spectra of different absolute temperatures. |
| Address |
Dept. Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia |
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Photonics Society of Poland |
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English |
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English |
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| ISSN |
2080-2242 |
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| Call Number |
IDA @ john @ |
Serial |
2685 |
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| Author |
Mitchell, D.; Gallaway, T. |
| Title |
Dark sky tourism: economic impacts on the Colorado Plateau Economy, USA |
Type |
Journal Article |
| Year |
2019 |
Publication |
Tourism Review |
Abbreviated Journal |
Tour. Rev. |
| Volume |
74 |
Issue |
4 |
Pages |
930-942 |
| Keywords |
Society; tourism; Colorado Plateau; United States; astrotourism |
| Abstract |
This paper aims to examine the economic impact from dark-sky tourism in national parks in the USA on the Colorado Plateau. The Colorado Plateau is a region encompassing parts of Arizona, Colorado, New Mexico and Utah that is known for its dark, star-filled night skies. Tourists in national parks are increasingly interested in observing this natural recreational amenity – especially considering that it is an ecological amenity that is quickly disappearing from the planet. Using a 10-year forecast of visitors to the national parks and using standard input-output modeling, it is observed that, for the first time anywhere, the value of dark skies to tourism in this area. The authors find that non-local tourists who value dark skies will spend $5.8bn over the next 10 years in the Colorado Plateau. These tourist expenditures will generate $2.4bn in higher wages and create over 10,000 additional jobs each year for the region. Furthermore, as dark skies are even more intense natural amenity in the non-summer months, they have the ability to increase visitor counts to national parks year-round and lead to a more efficient use of local community and tourism-related resources throughout the year. |
| Address |
Department of Economics, Missouri State University, Springfield, Missouri, USA; |
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Emerald Group |
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English |
Summary Language |
English |
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1660-5373 |
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IDA @ john @ |
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2684 |
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| Author |
Kaplan, K.A.; Mashash, M.; Williams, R.; Batchelder, H.; Starr-Glass, L.; Zeitzer, J.M. |
| Title |
Effect of Light Flashes vs Sham Therapy During Sleep With Adjunct Cognitive Behavioral Therapy on Sleep Quality Among Adolescents: A Randomized Clinical Trial |
Type |
Journal Article |
| Year |
2019 |
Publication |
JAMA Network Open |
Abbreviated Journal |
JAMA Netw Open |
| Volume |
2 |
Issue |
9 |
Pages |
e1911944 |
| Keywords |
Human Health |
| Abstract |
Importance: Owing to biological, behavioral, and societal factors, sleep duration in teenagers is often severely truncated, leading to pervasive sleep deprivation. Objective: To determine whether a novel intervention, using both light exposure during sleep and cognitive behavioral therapy (CBT), would increase total sleep time in teenagers by enabling them to go to sleep earlier than usual. Design, Setting, and Participants: This double-blind, placebo-controlled, randomized clinical trial, conducted between November 1, 2013, and May 31, 2016, among 102 adolescents enrolled full-time in grades 9 to 12, who expressed difficulty going to bed earlier and waking up early enough, was composed of 2 phases. In phase 1, participants were assigned to receive either 3 weeks of light or sham therapy and were asked to try to go to sleep earlier. In phase 2, participants received 4 brief CBT sessions in addition to a modified light or sham therapy. All analyses were performed on an intent-to-treat basis. Interventions: Light therapy consisted of receiving a 3-millisecond light flash every 20 seconds during the final 3 hours of sleep (phase 1) or final 2 hours of sleep (phase 2). Sham therapy used an identical device, but delivered 1 minute of light pulses (appearing in 20-second intervals, for a total of 3 pulses) per hour during the final 3 hours of sleep (phase 1) or 2 hours of sleep (phase 2). Light therapy occurred every night during the 4-week intervention. Cognitive behavioral therapy consisted of four 50-minute in-person sessions once per week. Main Outcomes and Measures: Primary outcome measures included diary-based sleep times, momentary ratings of evening sleepiness, and subjective measures of sleepiness and sleep quality. Results: Among the 102 participants (54 female [52.9%]; mean [SD] age, 15.6 [1.1] years), 72 were enrolled in phase 1 and 30 were enrolled in phase 2. Mixed-effects models revealed that light therapy alone was inadequate in changing the timing of sleep. However, compared with sham therapy plus CBT alone, light therapy plus CBT significantly moved sleep onset a mean (SD) of 50.1 (27.5) minutes earlier and increased nightly total sleep time by a mean (SD) of 43.3 (35.0) minutes. Light therapy plus CBT also resulted in a 7-fold greater increase in bedtime compliance than that observed among participants receiving sham plus CBT (mean [SD], 2.21 [3.91] vs 0.29 [0.76]), as well as a mean 0.55-point increase in subjective evening sleepiness as compared with a mean 0.48-point decrease in participants receiving sham plus CBT as measured on a 7-point sleepiness scale. Conclusions and Relevance: This study found that light exposure during sleep, in combination with a brief, motivation-focused CBT intervention, was able to consistently move bedtimes earlier and increase total sleep time in teenagers. This type of passive light intervention in teenagers may lead to novel therapeutic applications. Trial Registration: ClinicalTrials.gov identifier: NCT01406691. |
| Address |
Stanford Center for Sleep Sciences and Medicine, Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, California |
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English |
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2574-3805 |
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PMID:31553469 |
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no |
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GFZ @ kyba @ |
Serial |
2683 |
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| Author |
Renthlei, Z.; Trivedi, A.K. |
| Title |
Effect of urban environment on pineal machinery and clock genes expression of tree sparrow (Passer montanus) |
Type |
Journal Article |
| Year |
2019 |
Publication |
Environmental Pollution |
Abbreviated Journal |
Environmental Pollution |
| Volume |
255 |
Issue |
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Pages |
113278 |
| Keywords |
Animals |
| Abstract |
Increasing urbanisation is altering the physiology of wild animals and the mechanisms involved are largely unknown. We hypothesised that altering the physiology of urban organisms is due to the effect of extra light at night on the circadian clock by modulating the expression of pineal machinery and clock genes. Two experiments were performed. In Experiment 1, immediately after being procured from their respective sites (urban and rural sites), birds were released individually in LLdim light conditions. Circadian rhythm period, activity duration, and total activity count were calculated and did not differ between urban and rural birds. In Experiment 2, birds (from urban and rural habitats) were sampled at six time points at regular 4-h intervals, beginning 1 h after sunrise. We measured daily variations in plasma melatonin levels. We also analysed the expression levels of Aanat, Mel1A and Mel1B as an indicator of melatonin biosynthesis and action machinery. Clock and clock-controlled genes (Bmal1, Clock, Per2, Per3, Cry1 and Npas2) were studied in the hypothalamus, the pineal gland, and retina to investigate the effects of urban habitats on the circadian clock. Our results show that there is a lower expression of Aanat in the pineal gland and relatively low plasma melatonin levels in urban birds. Further, clock genes are also differentially expressed in all three central tissues of urban birds. We propose that alterations in the melatonin biosynthesis machinery and the expression of clock genes could result in miscalculations in the internal timing of the organism, with environmental timings leading to altered physiology in urban wild animals. |
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0269-7491 |
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GFZ @ kyba @ |
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2682 |
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